Kastar 2-Pack Battery Replacement for Honeywell Lynx - High Capacity

In this review the Kastar 2-Pack Battery Replacement is evaluated for owners of Honeywell and ADT Honeywell alarm panels who need dependable backup power. The bottom line: this Ni-MH 7.2V, 3700mAh replacement is aimed at users who want longer runtime and proven cycle life for Honeywell Lynx series units; its highest appeal is the large capacity and safety features that reduce the need for frequent battery swaps. For anyone running Lynx 5100, 5200 or similar panels, it offers a simple, high-capacity swap with familiar dimensions and good durability.

Key Features

• High Capacity: The 3700mAh rating provides noticeably longer run time for alarm panels compared with many standard replacements, reducing maintenance intervals.
• Compatible Form Factor: At about 3.94 in x 2.68 in x 0.68 in, the pack matches the size expected by Honeywell Lynx series and related modules, simplifying installation.
• Ni-MH Chemistry: Uses environmentally friendlier Ni-MH cells that avoid heavy metals like Hg, Cd, and Pb while delivering reliable discharge performance.
• Extended Cycle Life: Kastar adds a protective additive to the cathode to limit material degradation so cells can last up to roughly 1,200 recharge cycles under proper use.
• Low Self-Discharge: An embedded seal structure reduces self-discharge so the batteries hold charge longer when the alarm is idle or unused.
• Safety Construction: DBCK steel shell and internal protections reduce the risk of rupture or explosion from overpressure, improving long-term safety in a home security enclosure.

Who It's For

This pack is for homeowners, small businesses and security technicians who maintain Honeywell Lynx series panels and compatible ADT Honeywell units and want a higher-capacity, longer-lasting replacement. It is particularly suitable where longer standby time and fewer replacements are priorities, such as vacation homes or rarely serviced systems.

Those who should look elsewhere include users who require factory-branded OEM batteries with original part numbering for warranty tracking, or systems that specify a different voltage or physical configuration; verify the model compatibility list for specific panel models before purchase.

Pros & Cons

Pros

• High 3700mAh capacity delivers extended runtime for alarm panels compared with standard cells.
• Ni-MH chemistry is more eco-friendly and avoids toxic heavy metals.
• Designed with safety features and a robust steel shell to reduce failure modes in enclosed installations.
• Low self-discharge helps preserve charge during long idle periods.

Cons

• Not an OEM-labeled Honeywell pack, which may matter for users who prefer manufacturer-branded parts.
• Physical dimensions are specific; users must confirm fit in non-standard enclosures before purchase.

Specifications

Battery Type	Ni-MH
Voltage	7.2V
Capacity	3700mAh
Dimensions	3.94 in x 2.68 in x 0.68 in
Cycle Life	Up to 1,200 cycles (manufacturer guidance)
Safety Features	DBCK steel shell, cathode additive protection

Our Verdict

The Kastar 2-Pack is a practical, value-minded replacement for Honeywell Lynx and compatible ADT Honeywell alarm panels when longer runtime and improved cycle life are priorities. It is a good buy for users comfortable fitting a third-party high-capacity Ni-MH pack who want fewer battery replacements and added safety features without paying for OEM labeling.

Frequently Asked Questions

Will this battery fit my Honeywell Lynx 5200?
Yes, it is listed compatible with Lynx 5200 and several Lynx models, but confirm the physical dimensions and connector match your unit before installation.

How long will the battery last in normal use?
Runtime depends on system draw, but the 3700mAh capacity and low self-discharge design provide noticeably longer standby life than many standard replacements.

Is the chemistry safe for home use?
Yes, the Ni-MH cells avoid heavy metals like Hg, Cd and Pb and include a steel shell and cathode protection to reduce degradation and pressure-related risks.